The ads take the format of a short text ad that includes a title line, two short descriptive lines and a URL link to a website or a specific website page. The ad will appear on the page of results you decide you want to appear in. For instance page 1 for a search result.
The ads appear at the top and to the right of the organic search engine results. You can also pitch at what position on the page your ad will appear, through the amount you bid. Crudely this may mean the more you bid for a phrase, the higher your ad appear.